Dyson embedded interview prep

Roles they hire for

• Motor control firmware engineer
• Battery management firmware engineer

What they emphasise

• High-speed motors
• Battery packs
• Sensors in appliances

Brush up on

BLDC motor controlFOC basicsBMSADC samplingFault protection

How the rounds usually run

A typical consumer hardware loop for embedded roles. Companies vary by team and seniority.

Recruiter screen

• Background, role fit and logistics

Example: Walk me through your current project in two minutes.

Technical phone screen: C coding

• Live C coding: data structures, bit manipulation, memory
• Explaining your code and edge cases out loud

Example: Implement memmove and explain how you handle overlap.

Loop: embedded system design

• Architecture for a device feature end to end
• Power, memory and real-time trade-offs

Example: Design firmware for a wireless earbud's charging case.

Loop: RTOS, concurrency and debugging

• Scheduling, synchronization, priority inversion
• Hardware and software debugging with scopes and schematics

Example: Explain priority inversion and two ways to prevent it.

Hiring manager and behavioural

• Ownership, cross-functional work and judgement

Example: Tell me about a time you shipped under a hard deadline. What did you cut?

Practice questions

Original questions written for Dyson's focus areas, not leaked ones.

1. Explain field-oriented control at a level a firmware interviewer expects.
2. How do you protect a motor driver from over-current within microseconds?
3. Design state-of-charge estimation for a vacuum's battery pack.
4. How do you synchronise ADC sampling with PWM in a motor controller?
5. What safety checks would you run before spinning a motor at power-up?

Your prep playlist

Design rounds to practise

Themes are inferred from Dyson's public product lines.